دراسة قابلية استخدام حزم الوقود المطورة في قلب المفاعل 1000-VVER من حيث استقرار خصائصها الترموهيدروليكية

Abstract EN

In this work the Thermal hydraulic features of the traditional fuel assemblies (TVS) have been compared with the new ones (TVSA+ ) developed to improve reactor fuel cycle performance and to optimize fuel loading scheme.

In fact, running Russian Pressurized Water Reactors VVER-1000 with enhanced fuel cycle is considered to be the first priority to increase its competitiveness in the international market.

CFD models of the VVER-1000 fuel rod cells for TVS and TVSA+ assembly types were developed based on the technical documentation of a full-scale test facility built in the Kurchatov Institute, Russia.

For the comparative analyses, the thermal hydraulic parameters in each fuel assembly were simulated by the computational fluid dynamics (CFD) tool, Solid Works -Flow Simulation.

The temperature and the heat flux distribution over the all components of the fuel rod cells along the rod height were consequently determined.

Comparison of the two types of assemblies showed that TVSA+ assembly can burn in the reactor core with higher safety margins, and doesn't excess any operating limits during the whole reactor cycle.

Furthermore the TVSA+ might allow to achieve long fuel cycle batch, nearly flat neutron flux, and high fuel burn up